Hi again, the final situation is as below and I physically dismounted the sdb disk and booted with sda and no problem with raid..but if I dismount the first disk the machine cannot find a boot sector to boot, I mean no system found message...Should I mark the first partitions of both disks "bootable" ??? thanx for your help, Murat Filesystem Size Used Avail Use% Mounted on /dev/md0 3.9G 1.2G 2.6G 30% / /dev/md1 1.5G 873M 561M 61% /usr /dev/md2 4.8G 33M 4.5G 1% /edi /dev/md3 5.7G 33M 5.3G 1% /data shmfs 377M 0 376M 0% /dev/shm lilo.conf inst03:/etc # more lilo.conf disk = /dev/sda bios = 0x80 disk = /dev/sdb bios = 0x81 boot = /dev/md0 vga = 791 read-only menu-scheme = Wg:kw:Wg:Wg lba32 prompt timeout = 80 message = /boot/message image = /boot/vmlinuz label = linux root = /dev/md0 initrd = /boot/initrd append = "enableapic vga=0x0317" image = /boot/vmlinuz.suse label = failsafe root = /dev/md0 initrd = /boot/initrd.suse append = "disableapic ide=nodma apm=off" optional image = /boot/memtest.bin label = memtest86 inst03:/etc # swapon -s Filename Type Size Used Priority /dev/sda2 partition 787176 0 42 /dev/sdb2 partition 787176 0 42 sfdisk -d /dev/sda /dev/sda1 : start= 63, size= 8401932, Id=fd /dev/sda2 : start= 8401995, size= 1574370, Id=82 /dev/sda3 : start= 9976365, size= 3148740, Id=fd /dev/sda4 : start= 13125105, size=22410675, Id= 5 /dev/sda5 : start= 13125168, size=10249407, Id=fd /dev/sda6 : start= 23374638, size=12161142, Id=fd sfdisk -d /dev/sdb /dev/sdb1 : start= 63, size= 8401932, Id=fd /dev/sdb2 : start= 8401995, size= 1574370, Id=82 /dev/sdb3 : start= 9976365, size= 3148740, Id=fd /dev/sdb4 : start= 13125105, size=22410675, Id= 5 /dev/sdb5 : start= 13125168, size=10249407, Id=fd /dev/sdb6 : start= 23374638, size=12161142, Id=fd - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html